MLA

The Loyal Lovers: or, Carmarthen Tragedy. printed and sold at Sympson's warehouse, 0AD. https://collections.library.yale.edu/catalog/17124807.

APA, 6th edition

The loyal lovers: or, Carmarthen tragedy. (0 C.E.). [Early works to 1800, Single sheet verse, Broadside poems]. printed and sold at Sympson's warehouse. https://collections.library.yale.edu/catalog/17124807.